What I can reccomend
There is a very important difference between rivers You know and polish rivers. If you want to catch two trouts for example, you have to know exactly where are this two trouts, becouse it is all fish in 10km of river you can visit dayly.
In other situation, you will need a very good luck to catch a fish bigger than you streamer.
I have been two times in this area, it is no sense for me to ride hundreds kilometers. But if you want to, you will find a beautiful river, beautiful nature aroud.